11818161 has 12 divisors (see below), whose sum is σ = 17621760. Its totient is φ = 7624440.

The previous prime is 11818151. The next prime is 11818181. The reversal of 11818161 is 16181811.

It is not a de Polignac number, because 11818161 - 2⁶ = 11818097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11818141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20901 + ... + 21458.

It is an arithmetic number, because the mean of its divisors is an integer number (1468480).

Almost surely, 2^11818161 is an apocalyptic number.

It is an amenable number.

11818161 is a deficient number, since it is larger than the sum of its proper divisors (5803599).

11818161 is a wasteful number, since it uses less digits than its factorization.

11818161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42396 (or 42393 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 11818161 is about 3437.7552268886. The cubic root of 11818161 is about 227.7805483083.

Adding to 11818161 its reverse (16181811), we get a palindrome (27999972).

The spelling of 11818161 in words is "eleven million, eight hundred eighteen thousand, one hundred sixty-one".